// Package domain contains pure domain models with no external dependencies.
// These types represent the core business concepts of the service.
package domain

import "errors"

// Domain errors - these are business-level errors that should be translated
// to appropriate HTTP status codes by the handler layer.
var (
	// ErrInvalidTheme indicates the theme value is not one of: light, dark, system.
	ErrInvalidTheme = errors.New("invalid theme: must be light, dark, or system")

	// ErrInvalidLanguage indicates the language value is empty.
	ErrInvalidLanguage = errors.New("invalid language: must be non-empty")

	// ErrInvalidDigest indicates the digest value is not one of: daily, weekly, never.
	ErrInvalidDigest = errors.New("invalid digest: must be daily, weekly, or never")
)